iframe_sandbox_window_open_download_block_downloads.tentative.html

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This test has a WPT meta file that expects 3 subtest issues.
This WPT test may be referenced by the following Test IDs:
- /html/semantics/embedded-content/the-iframe-element/iframe_sandbox_window_open_download_block_downloads.tentative.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<meta charset="utf-8">

<title>Downloads triggered by window.open from sandbox are blocked.</title>

<link rel="help" href="https://html.spec.whatwg.org/multipage/#attr-iframe-sandbox">

<link rel="help" href="https://html.spec.whatwg.org/multipage/#the-iframe-element">

<script src="/common/utils.js"></script>

<script src="/resources/testharness.js"></script>

<script src='/resources/testharnessreport.js'></script>

<script src="support/iframe_sandbox_download_helper.js"></script>

<body>

<script>

"use strict";

['', '"_blank"', '"_blank", "noopener"'].forEach(options =>

  async_test(t => {

    const download_token = token();

    let iframe = document.createElement("iframe");

    const download_link = `support/download_stash.py?token=${download_token}` +

          `&finish-delay=${StreamDownloadFinishDelay()}`;

    iframe.srcdoc = `<script>window.open("${download_link}", ${options})</scr` +

      `ipt>`;

    iframe.sandbox = "allow-same-origin allow-popups allow-scripts";

    AssertDownloadFailure(t, download_token, StreamDownloadFinishDelay() +

                          DownloadVerifyDelay());

    document.body.appendChild(iframe);

  }, `window.open(download, ${options}) triggering download in ` +

             'sandbox is blocked.'));

</script>

</body>